Alert archive / Pennsylvania / River Flood Warnings in 2020

River Flood Warning 42, NWS Philadelphia/Mount Holly

November 30, 2020Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Nov 30, 2020, 5:35 PM EST for Delaware County, Pennsylvania. It took effect at Nov 30, 2020, 5:43 PM EST. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Nov 30, 2020, 5:35 PM EST (22:35 UTC)
In effect from
Nov 30, 2020, 5:43 PM EST
Expired
Nov 30, 2020, 9:28 PM EST
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
Minor

County Delaware County, PA

The radar

The Philadelphia radar (KDIX), 86 km from the middle of the area, began a volume at 22:36 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The river

Written for the forecast point Chester Creek near Chester (CHSP1). The gauge peaked at 8.16 ft at Nov 30, 2020, 6:00 PM EST.

actionminormoderate51011/3012/0112/02
Action stage
7 ft
Minor stage
8 ft
Moderate stage
10 ft
Major stage
14 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01477000, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

The text

As transmitted.

120 
WGUS41 KPHI 302235
FLWPHI

BULLETIN - EAS ACTIVATION REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
535 PM EST Mon Nov 30 2020

...The National Weather Service in Mount Holly NJ has issued a Flood 
Warning for the following rivers in Pennsylvania...

  Chester Creek Near Chester affecting Delaware County.

For the Chester Creek...including Chester...Minor flooding is 
forecast.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Additional information is available at www.weather.gov/phi.


PAC045-010730-
/O.NEW.KPHI.FL.W.0042.201130T2243Z-201201T0718Z/
/CHSP1.1.ER.201130T2243Z.201130T2300Z.201201T0117Z.NO/
535 PM EST Mon Nov 30 2020

The National Weather Service in Mount Holly has issued a

* Flood Warning for
  the Chester Creek Near Chester.
* Until late tonight.
* At 5:30 PM EST Monday the stage was 7.7 feet.
* Flood stage is 8.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage late 
  this afternoon to a crest of 8.4 feet this evening. It will then 
  fall below flood stage this evening.
* Impact at 7.0 feet...The creek floods adjacent open land.
* Flood History...This crest compares to a previous crest of 8.6 
  feet on 09/18/2004.

&&


Stream          Fld   Observed        Fcsts (6 pm)        Crest
Location        Stg   Stg Day/Time    Tue  Wed        Stg Time Date

Chester Creek
Chester         8.0   7.7  Mon 5 pm   3.6  MSG        8.4 6pm 11/30





&&

LAT...LON 3991 7542 3985 7534 3981 7540 3987 7547

$$

PO
2 follow-up statements
862 
WGUS41 KPHI 010108
FLWPHI

BULLETIN - EAS ACTIVATION REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
808 PM EST Mon Nov 30 2020

...Observed flooding changed to Minor severity and increased in 
duration for the following rivers in Pennsylvania...

  Chester Creek Near Chester affecting Delaware County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Additional information is available at www.weather.gov/phi.


PAC045-010600-
/O.EXT.KPHI.FL.W.0042.000000T0000Z-201201T0600Z/
/CHSP1.N.ER.201130T2251Z.201130T2316Z.201130T2351Z.NO/
808 PM EST Mon Nov 30 2020

...Observed flooding increased to Minor severity and increased in 
duration until just after midnight tonight...

The Flood Warning continues for
  the Chester Creek Near Chester.
* Until late tonight.
* At 7:46 PM EST Monday the stage was 7.4 feet.
* Flood stage is 8.0 feet.
* Minor flooding is occurring.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 7:46 PM EST Monday was 8.2 feet.
* Forecast...The river is expected to continue to slowly fall this 
  evening.
* Impact at 7.0 feet...The creek floods adjacent open land.
* Flood History...This crest compares to a previous crest of 7.7 
  feet on 03/22/1999.

&&


Stream          Fld   Observed        Fcsts (8 pm)        Crest
Location        Stg   Stg Day/Time    Tue             Stg Time Date

Chester Creek
Chester         8.0   7.4  Mon 7 pm   3.6             7.5 9pm 11/30





&&

LAT...LON 3991 7542 3985 7534 3981 7540 3987 7547

$$

BAH
706 
WGUS81 KPHI 010228
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
928 PM EST Mon Nov 30 2020

...The Flood Warning is cancelled for the Chester Creek near 
Chester...
PAC045-010330-
/O.CAN.KPHI.FL.W.0042.000000T0000Z-201201T0228Z/
/CHSP1.N.ER.700119T1419Z.700119T1419Z.700119T1419Z.NO/
928 PM EST Mon Nov 30 2020

...The Flood Warning for the Chester Creek Near Chester has been 
cancelled...

The Flood Warning is cancelled for
  the Chester Creek Near Chester.
* At 9:15 PM Monday the creek level was 7.3 feet.
* Flood stage is 8.0 feet.
* Forecast...The creek level is expected to continue falling 
  overnight.

&&


Stream          Fld   Observed        Fcsts (9 pm)        Crest
Location        Stg   Stg Day/Time    Tue  Wed        Stg Time Date

Chester Creek
Chester         8.0   7.3  Mon 9 pm   3.3  MSG        Crested  





&&

LAT...LON 3991 7542 3985 7534 3981 7540 3987 7547

$$

Iovino

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 30, 12:15 PM ESTAreal Flood AdvisoryPHIChester, Delaware3 hr
Nov 30, 12:41 PM ESTSpecial Weather StatementPHIChester, Montgomery49 min
Nov 30, 2:17 PM ESTAreal Flood WarningPHIBerks, Bucks, Lehigh, Montgomery9 hr
Nov 30, 2:18 PM ESTCoastal Flood AdvisoryPHIBucks, Delaware, Philadelphia2 hr
Nov 30, 2:41 PM ESTSevere Thunderstorm WarningPHIChester, Delaware49 min
Nov 30, 2:48 PM ESTAreal Flood WarningPHIChester, Delaware, Montgomery8 hr
Nov 30, 3:01 PM ESTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery, Philadelphia44 min
Nov 30, 3:26 PM ESTAreal Flood WarningPHIBerks, Bucks, Carbon, Lehigh, Monroe, Northampton4 hr
Nov 30, 3:43 PM ESTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Monroe, Montgomery, Northampton and 1 more47 min
Nov 30, 3:51 PM ESTRiver Flood WarningPHIChester14 hr
Nov 30, 3:53 PM ESTAreal Flood WarningPHIMonroe, Northampton16 hr
Nov 30, 3:53 PM ESTTornado WarningPHIBucks, Montgomery13 min
Nov 30, 4:17 PM ESTAreal Flood WarningPHIBucks, Delaware, Montgomery, Philadelphia10 hr
Nov 30, 5:30 PM ESTRiver Flood WarningPHIChester, Delaware16 hr
Nov 30, 5:33 PM ESTRiver Flood WarningPHIMontgomery10 hr

Nearby

River Flood Warnings in Pennsylvania, 2020Every river flood warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.